B&R 7CP474.60-1 CPU Processor Module for System 2003

Product Overview

The B&R 7CP474.60-1​ is the flagship central processing unit of the B&R System 2003 modular control family, and it remains one of the most specified legacy CPUs in Central European machine automation. Occupying a double-width footprint across rack slots 1 and 2, the B&R 7CP474.60-1​ integrates the processor, the user and system memory, the real-time clock, the I/O bus controller, and two communication interfaces in a single module — eliminating the separate power-supply and communication modules that bloat a small control cabinet. Its role is unambiguous: fetch the process image from the I/O slices, execute the IEC 61131-3 user program deterministically, drive the outputs, and serve as the master on the I/O bus and the CAN network. In a System 2003 rack, everything waits on the scan of the B&R 7CP474.60-1, which is why its 0.8 µs average instruction cycle time — twice as fast as the CP470/CP770 sibling — is not a brochure number but the governing limit of machine cycle time.

Memory is partitioned exactly as a real-time controller should partition it. 100 KB of battery-backed SRAM is reserved for the running user program and for retentive variables; 512 KB of FlashPROM holds the system firmware, while a second 512 KB FlashPROM bank holds the user program and constants. Because the user PROM is non-volatile, the machine starts in a known state after a power restoration without a battery-dependent bootstrap. The non-volatile real-time clock, resolvable to one second and buffered by the optional 0AC201.91​ lithium battery pack (four 3 V / 950 mAh button cells), gives every alarm, reject, and quality event a trustworthy time stamp — a requirement that turns a maintenance log into evidence.

What makes the B&R 7CP474.60-1​ distinctive in its class is the combination of density and isolation. Four slots for screw-in modules sit directly on the CPU, accepting interface and specialty modules without consuming rack slots or backplane bandwidth, and the published I/O ceiling is 208 digital points and 80 analog points. The CAN interface is electrically isolated and network-capable, so a fieldbus run through a cabinet crowded with VFDs, contactors, and welding transformers does not become a source of bit errors. Add the integrated hardware watchdog and internal overvoltage/undervoltage monitoring, and the B&R 7CP474.60-1​ is a component you can justify keeping in service: it is predictable, testable, and documented, which is more than can be said for many nominally newer replacements.

Technical Specifications